A plastic material inspired by the leaves of the aquatic weed Salvinia molesta may lead to a coating that makes ships more buoyant and hydrodynamic
It may be an invasive weed that's fouling waterways in the U.S., Australia and other countries, but it turns out that Salvinia molesta has at least one good point - it's inspired a man-made coating that could help ships stay afloat. The upper surface of the floating plant's leaves are coated with tiny water-repellent hairs, each of which is topped with a bizarre eggbeater-like structure. These hairs trap a layer of air against the leaf, reducing friction and providing buoyancy, while the eggbeaters grab slightly at the surrounding water, providing stability. Scientists at Ohio State University have successfully replicated these hairs in plastic, creating a buoyant coating that is described as being like "a microscopic shag carpet."
"I've studied the gecko feet, which are sticky, and the lotus leaf, which is slippery," said lead researcher Bharat Bhushan. "Salvinia combines aspects of both."